US20170013743A1 - Motor drive device in which fan motor is exchangeable and control panel including same - Google Patents
Motor drive device in which fan motor is exchangeable and control panel including same Download PDFInfo
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- US20170013743A1 US20170013743A1 US15/189,344 US201615189344A US2017013743A1 US 20170013743 A1 US20170013743 A1 US 20170013743A1 US 201615189344 A US201615189344 A US 201615189344A US 2017013743 A1 US2017013743 A1 US 2017013743A1
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- duct
- opening
- control panel
- heat sink
- motor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
- H05K7/20918—Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
-
- H02P29/0044—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20154—Heat dissipaters coupled to components
- H05K7/20163—Heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20409—Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Inverter Devices (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
In a motor drive device of the present invention, a motor control unit is disposed on a first surface of an attaching unit, and a heat sink is disposed on a second surface opposite to the first surface. A first duct connects the second surface and the heat sink with each other. A second duct is disposed on the first surface, and a fan motor is disposed in the second duct. A space inside the first duct in communication with only a second opening of the attaching unit, and a space inside the second duct is in communication with both a first opening and the second opening of the attaching unit.
Description
- 1. Field of the Invention
- The present invention relates to a motor drive device that is implemented in a control panel, such, for example, as a heavy electrical control panel of an NC machine tool. In particular, the present invention relates to a motor drive device including a motor control unit, a heat sink attached to the motor control unit, and a fan motor for cooling the heat sink, wherein the fan motor is removably mounted, and a control panel including such a device.
- 2. Description of the Related Art
- In a motor control unit of the motor drive device that is implemented in the control panel, there is mounted a heat sink for heat dissipation. The cooling effect of the heat sink is enhanced by disposing the fan motor adjacent to the heat sink.
- Further, in order to prevent hot air from being filled in the control panel, sometimes a hole or notch is formed in a rear wall portion of the control panel, dispose the motor control unit of the motor drive device in the control panel, and let only the heat sink attached to the motor control unit via an attaching unit come out of the control panel through a hole or notch of the rear wall portion of the control panel. In such a case, generally, the fan motor for cooling the heat sink is also disposed outside the control panel. The hole or notch of the rear wall portion is closed by the attaching unit of the motor drive device.
- In most cases, since the control panel is provided adjacent to a wall of a building other machinery or the like, there is almost no space through which a person can pass at the rear side of the control panel. Therefore, it is difficult to get access to the fan motor from the rear side of the control panel to exchange and inspect the fan motor.
- Thus, it has been proposed to form a second hole through which the fan motor can be passed in the rear wall portion of the control panel, together with the first hole that permits passage of the heat sink (for example, refer to Japanese Laid-open Patent Publication No. 2009-27776). According to this proposal, it is possible move the fan motor existing at the rear side of the control panel to the front side (front face) of the control panel through the second hole, thereby inspecting and exchanging the fan motor. Alternatively, it is sometimes the case that a hole through which the heat sink and the air blower can be passed together is formed in the rear wall portion of the control panel and an additional hole through which the air blower can be passed is formed in the attaching unit of the motor drive device.
- Furthermore, in Japanese Patent No. 5312012 and Japanese Patent No. 3404907, a structure has been proposed in which for the purpose of maintenance of the device, a duct provided between an air blowing fan and a heat generating component is made attachable and removable.
- However, the above-described conventional technique has problems as follows. The problems of the conventional technique will now be described based on
FIG. 6 .FIG. 6 is a top view schematically illustrating a main portion of a conventional motor drive device which is implemented in a control panel. - According to
FIG. 6 , amotor control unit 102 of a motor drive device which is implemented in acontrol panel 101 is attached to afront face 103 a of arear wall portion 103 of thecontrol panel 101. A hole ornotch 103 b is formed in therear wall portion 103 of thecontrol panel 101. Aheat sink 104 attached to themotor control unit 102 is disposed outside the control panel 101 (particularly, at the rear side of the control panel 101) through the hole ornotch 103 b. Afan motor 105 is disposed on the upper end of theheat sink 104 disposed at the rear side of thecontrol panel 101. With such a structure, in order to attach or remove thefan motor 105 from the front side (front face) of thecontrol panel 101, it is required that thefan motor 105 be passed through the hole ornotch 103 b in therear wall portion 103 of thecontrol panel 101. Therefore, it is necessary to select, as thefan motor 105, a fan motor which is smaller than thenotch 103 b in therear wall portion 103 of thecontrol panel 101. In other words, as illustrated inFIG. 6 , the size A of thefan motor 105 cannot be made larger than the size B of thenotch 103 b, so that usable fan motors are limited. - The present invention provides a motor drive device for which a fan motor having a large size can be selected while ensuring the cooling effect of a heat sink, and a control panel including the motor driving device.
- According to a first aspect of the present invention, there is provided a motor drive device including:
- a motor control unit disposed in a control panel;
- an attaching unit provided at one side of the motor control unit and having a first surface directed toward the front of the control panel and a second surface opposite to the first surface;
- a heat sink attached to the one side of the motor control unit or the second surface of the attaching unit and absorbing heat of the motor control unit;
- a first duct disposed in opposing relationship to the second surface of the attaching unit;
- a second duct disposed in opposing relationship to the first duct at a side opposite to a side of the attaching unit at which the first duct is disposed; and
- an air blower disposed in the second duct,
- wherein:
- between the first duct and the second duct, there are formed a first opening that allows communication between outside of the first duct and inside of the second duct, and a second opening that allows communication between inside of the first duct and inside of the second duct;
- the first duct is provided so as to connect the heat sink and the second opening with each other;
- the second duct is provided so as to connect the first opening and the second opening with each other; and
- the air blower is disposed so as to generate an air flow from the first opening to the second opening or from the second opening to the first opening.
- According to a second aspect of the present invention, there is provided the motor drive device according to the first aspect, wherein the second duct and the air blower are removably attached with respect to the first surface.
- According to a third aspect of the present invention, there is provided the motor drive device according to the first or second aspect, wherein the air blower is removably attached with respect to the second duct.
- According to a fourth aspect of the present invention, there is provided the motor drive device according to any one of the first to third aspects, wherein the first duct is removably attached with respect to the heat sink.
- According to a fifth aspect of the present invention, there is provided the motor drive device according to any one of the first to fourth aspects, wherein the first duct is formed as a portion of the heat sink.
- According to a sixth aspect of the present invention, there is provided the motor drive device according to any one of the first to fifth aspects, wherein the air blower is disposed in the second duct so as to blow air in a direction parallel to the first surface.
- According to a seventh aspect of the present invention, there is provided the motor drive device according to any one of the first to fifth aspects, wherein the air blower is disposed in the second duct so as to blow air in a direction intersecting with the first surface, and an intake portion and an exhaust portion of the air blower are disposed in opposing relationship to the second opening.
- According to an eighth aspect of the present invention, there is provided a control panel including the motor drive device according to any one of the first to seventh aspects, wherein:
- a notch or hole that allows both the heat sink and the first duct to pass therethrough is formed in a rear wall portion of the control panel; and
- the attaching unit is fixed to the rear wall portion in the control panel, both the heat sink and the first duct are disposed outside the control panel through the notch or hole, and the first opening is in communication with a space outside the first duct through the notch or hole.
- The objects, features, and advantages as well as other objects, features, and advantages of the present invention will become more clear from a detailed description of exemplary embodiments of the present invention illustrated in the accompanying drawings.
-
FIG. 1 is a simplified side sectional view of a control panel in which a motor drive device of a first embodiment is implemented. -
FIG. 2 is an enlarged perspective view illustrating the motor drive device illustrated inFIG. 1 , together with a portion of a rear wall portion of the control panel. -
FIG. 3 is a longitudinal sectional view schematically illustrating the motor drive device of the first embodiment. -
FIG. 4 is a longitudinal sectional view schematically illustrating a modification to the motor drive device of the first embodiment. -
FIG. 5 is a longitudinal sectional view schematically illustrating a motor drive device of a second embodiment. -
FIG. 6 is a top view schematically illustrating a major portion of a conventional motor drive device implemented in a control panel. - Embodiments of the present invention will next be described with reference to the drawings. In the following, like members are assigned like reference numerals throughout the drawings. To facilitate understanding, the scale of the drawings is changed appropriately. Further, the forms illustrated in the drawings are by way of example for practicing the present invention, and the present invention is not limited to the illustrated forms.
-
FIG. 1 is a simplified side sectional view of a control panel in which a motor drive device of a first embodiment is implemented.FIG. 2 is an enlarged perspective view illustrating the motor drive device illustrated inFIG. 1 , together with a portion of a rear wall portion of the control panel. However, inFIG. 2 , there is illustrated a state in which a fan motor and a second duct illustrated inFIG. 1 are removed from a motor control unit of the motor drive device. - As illustrated in
FIG. 1 , thecontrol panel 11 in which themotor drive device 1 is implemented is installed adjacent to awall 12 of a building or other machinery. Thecontrol panel 11 is, for example, a heavy electrical control panel of an NC machine tool, and themotor drive device 1 includes, for example, amotor control unit 10 for controlling aservo motor 21, aheat sink 14 for cooling thecontrol unit 10, and anair blower 20. - A housing of the
control panel 11 of the present embodiment includes afront wall portion 11 a and arear wall portion 11 b which are disposed in parallel to each other as illustrated inFIG. 1 . Therear wall portion 11 b is disposed in opposing relationship to awall 12 of a building. Furthermore, thefront wall portion 11 a is composed of a door provided with a transparent window for enabling an operator of thecontrol panel 11 to view and operate themotor drive device 1 and meters and switches (not illustrated) in thecontrol panel 11. - Further, on one side of the
motor control unit 10 of themotor drive device 1, there is provided a plate-like attachingunit 13 for attaching themotor control unit 10 to afront surface 11b 1 of therear wall portion 11 b of thecontrol panel 11. The attachingunit 13 has a first surface directed toward the front of thecontrol panel 11 and a second surface opposite to the first surface. To the second surface of the attachingunit 13, there are attached theheat sink 14 and afirst duct 15. Thefirst duct 15 is formed as a portion of theheat sink 14. Furthermore, preferably, theheat sink 14 is shaped approximately corresponding to one side of themotor control unit 10 for the purpose of cooling themotor control unit 10. Further, theheat sink 14 is preferably formed of metal superior in thermal conductivity, such as aluminum, copper or the like. - The
heat sink 14, although illustrated in simplified form inFIG. 1 , includes, for example, a plurality of cooling fins, which are rectangular extending vertically and disposed with predetermined intervals. Needless to say, theheat sink 14 is not limited to the one including such cooling fins, but may be of any structure that provides an effect allowing heat to escape from themotor control unit 10 to outside. For example, theheat sink 14 may be configured by forming a plurality of cylindrical or conical protrusions on a surface of a metal block. - Further, as can be seen from
FIGS. 1 and 2 , a notch orhole 16 is formed in therear wall portion 11 b of thecontrol panel 11. Although themotor control unit 10 is disposed in thecontrol panel 11, theheat sink 14 and thefirst duct 15, which are attached to the attachingunit 13 of themotor control unit 10, are disposed outside the control panel 11 (particularly at the rear side of the control panel 11) through the notch orhole 16. Therefore, the notch orhole 16 of therear wall portion 11 b is formed more largely than thefirst duct 15 which is a portion of theheat sink 14. Further, the attachingunit 13 is formed one size larger than the notch orhole 16. By thus defining the respective sizes of the attachingunit 13 and the notch orhole 16, it is possible to cause the attachingunit 13 of themotor control unit 10 abutted against and fixed to thefront surface 11b 1 of therear wall portions 11 b of thecontrol panel 11, with only theheat sink 14 being disposed outside thecontrol panel 11. - Thus, when it is desired to clean the
heat sink 14 and thefirst duct 15, it is possible for a cleaning worker to access the attachingunit 13 from the front side of thecontrol panel 11 and attach and remove theheat sink 14 and thefirst duct 15, together with the attachingunit 13. - Further, as illustrated in
FIG. 2 , a portion of the mountingunit 13 above themotor control unit 10 is formed with afirst opening 17 and asecond opening 18 which each penetrate from the first surface to the second surface of the attachingunit 13. Theopenings first opening 17 is communication with a space external of thefirst duct 15 through the notch orhole 16 formed in therear wall portion 11 b of thecontrol panel 11. Furthermore, thesecond opening 18 is in communication with a space above theheat sink 14 in thefirst duct 15. Although the illustratedfirst duct 15 covers the whole of theheat sink 14 except for the lower end of theheat sink 14, there is no limitation to such a shape. In the present invention, thefirst duct 15 is preferred to have at least a shape for connecting thesecond opening 18 in the second surface of the attachingunit 13 and one end of theheat sink 14 existing adjacent to thesecond opening 18. - Referring again to
FIG. 1 , asecond duct 19 is removably attached to the first surface of the attachingunit 13 with unillustrated bolts. In other words, thesecond duct 19 is attachable and removable with respect to the attachingunit 13 fixed to thefront surface 11b 1 of therear wall portion 11 b of thecontrol panel 11. Further, in thesecond duct 19, there is provided afan motor 20 that serves as the air blower. - With such a configuration, as illustrated in
FIG. 2 , it is possible to attach and remove thesecond duct 19 and thefan motor 20 from the front side of thecontrol panel 11 when exchanging and inspecting thefan motor 20. Further, it is possible to freely select the size of thefan motor 20 since there is no need to pass thefan motor 20 through the hole or notch formed in therear wall portion 11 b of thecontrol panel 11 or the attachingunit 13 of themotor control unit 10. - Furthermore, with regard to the attachment of the
fan motor 20, a method is conceivable of removably fixing thefan motor 20 to the attachingunit 13 and fixing thesecond duct 19 to the attachingunit 13 so as to cover the fixedfan motor 20. Alternatively, a method is conceivable of removably fixing thefan motor 20 in thesecond duct 19 and attaching thesecond duct 19, in which thefan motor 20 is fixed, to the attachingunit 13. By the latter method, thefan motor 20 can be removed along with thesecond duct 19, so that work can be reduced more than by the former method. Furthermore, in the present embodiment, thefan motor 20 is disposed in thesecond duct 19 so as to blow air in a direction parallel to the first surface of the attachingunit 13. In this instance, thefan motor 20 is disposed intermediate between thefirst opening 17 and thesecond opening 18. - Further, in the present invention, as illustrated in
FIG. 1 , thesecond duct 19 is formed so as to cover both thefirst opening 17 and thesecond opening 18. In this manner, the inside space of thesecond duct 19 is in communication with the both thefirst opening 17 and thesecond opening 18. Furthermore, the inside space of thefirst duct 15, which is located opposite to thesecond duct 19 with the attachingunit 13 held therebetween, is only in communication with thesecond opening 18. With such a configuration, the air in thefirst duct 15 existing outside thecontrol panel 11 is allowed to flow from thesecond opening 18 of the attachingunit 13 through the inside space of thesecond duct 19 existing in thecontrol panel 11 and from thefirst opening 17 of the attachingunit 13 to outside of thefirst duct 15. Furthermore, the air outside thefirst duct 15 existing outside thecontrol panel 11 is allowed to flow from thefirst opening 17 of the attachingunit 13 through the inside space of thesecond duct 19 existing in thecontrol panel 11 and from thesecond opening 18 of the attachingunit 13 into thefirst duct 15 existing outside thecontrol panel 11. By generating such air flows by thefan motor 20 in thesecond duct 19, it is possible to cool theheat sink 14 in thefirst duct 15. - Thus, in the present invention, it is possible to cool the
heat sink 14 regardless of thefan motor 20 not being disposed adjacent to theheat sink 14. - Referring to
FIG. 3 , description will be made of the operation for cooling themotor control unit 10 of themotor drive device 1.FIG. 3 is a longitudinal sectional view schematically illustrating themotor drive device 1 of the first embodiment. However, in order to facilitate understanding ofFIG. 3 , the section of themotor control unit 10 is illustrated simplified as a flat section. - When the
fan motor 20 is driven, an air flow such as indicated by arrows inFIG. 3 occurs. Specifically, thefan motor 20 is disposed so as to generate an upward wind in thesecond duct 19. When the wind is sent from a space below thefan motor 20 in thesecond duct 19 toward a space thereabove, the air in the vicinity of the lower end of thefirst duct 15 flows through theheat sink 14 to a space above theheat sink 14 in thefirst duct 15. Then, theheat sink 14, which has absorbed the heat of themotor control unit 10, is cooled. The air flowing in the space above theheat sink 14 in thefirst duct 15 enters from thesecond opening 18 into thesecond duct 19 and is sent upwardly by thefan motor 20. Further, the air sent to the space above thefan motor 20 in thesecond duct 19 is exhausted to outside thecontrol panel 11 through thefirst opening 17. -
FIG. 4 is a longitudinal sectional view schematically illustrating a modification to themotor drive device 1 of the first embodiment described above. However, in order to facilitate understanding ofFIG. 4 , the section of themotor control unit 10 is illustrated simplified as a flat section. - In the first embodiment illustrated in
FIGS. 1 through 3 , thesingle fan motor 20 is provided in thesecond duct 19. However, the number of thefan motor 20 is not limited to single, and the configuration of themotor drive device 1 may be modified as illustrated inFIG. 4 . For example, as illustrated inFIG. 4 , it may be configured such that twofan motors 20 are provided in thesecond duct 19 and eachfan motor 20 generates an upward wind in thesecond duct 19. Needless to say, the number of thefan motors 20 may be three or more. The shape of thesecond duct 19 may be changed depending on the number of thefan motors 20. However, preferably thesecond duct 19 is formed so as to guide the wind from thefirst opening 17, through thefan motor 20, to thesecond opening 18 or from thesecond opening 18, through thefan motor 20, to thefirst opening 17. - By increasing the number of the
fan motors 20 as in the modification illustrated inFIG. 4 , it is possible to enhance the cooling effect of theheat sink 14 with respect to themotor control unit 10. - Note that, although in each of the views of
FIGS. 3 and 4 , a state is illustrated in which thefan motor 20 generates an upward wind in thesecond duct 19, thefan motor 20 may be driven to generate a downward wind in thesecond duct 19. In such a case, the flow of the wind cooling theheat sink 14 is directed opposite to the direction indicated by the arrows inFIGS. 3 and 4 . - Further, while, in the first embodiment, the two
openings FIG. 2 , in the present invention, theopenings second duct 19 is a horizontal flow in thesecond duct 19. - Description will next be made of a second embodiment. However, components the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Accordingly, only the differences with respect to the components of the first embodiment are described.
-
FIG. 5 is a longitudinal sectional view schematically illustrating the motor drive device of the second embodiment. However, in order to facilitate understanding ofFIG. 5 , the section of themotor control unit 10 is illustrated simplified as a horizontal section. - In the first embodiment described above, the
fan motor 20 is disposed to blow air upward or downward in thesecond duct 19. In contrast, in the second embodiment, as illustrated inFIG. 5 , thefan motor 20 is disposed in thesecond duct 19 so as to blow air in a direction intersecting the first surface of the attachingunit 13. - Further, the
fan motor 20 is disposed in thesecond duct 19 such that an intake portion or an exhaust portion of thefan motor 20 is opposite to thesecond opening 18. Preferably, thesecond duct 19 is formed so as to guide the wind blown out from thefan motor 20 to thefirst opening 17. The other configuration is the same as the first embodiment described above (refer toFIGS. 1 through 4 ). - In the case of the second embodiment, when the
fan motor 20 is driven, an air flow such as indicated by arrows inFIG. 5 is generated. Specifically, thefan motor 20 is disposed in thesecond duct 19 so as to blow air in a direction intersecting the first surface of the attachingunit 13, particularly in a direction away from thesecond opening 18 of the attaching unit 13 (from right to left as viewed inFIG. 5 ). As air is sent from thesecond opening 18 to which thefan motor 20 is opposite toward a space leftward of thefan motor 20 in thesecond duct 19, the air in the vicinity of the lower end of thefirst duct 15 is allowed to flow through theheat sink 14 to a space above theheat sink 14 in thefirst duct 15. Then, theheat sink 14, which has absorbed heat from themotor control unit 10, is cooled. The air which has flown to the space above theheat sink 14 in thefirst duct 15 is blown by thefan motor 20 through thesecond opening 18 against the inner wall surface of thesecond duct 19. In this manner, the blown air is sent along the inner wall surface of thesecond duct 19 to thefirst opening 17 and exhausted to outside of thecontrol panel 11 through thefirst opening 17. - Note that, although in
FIG. 5 , a state illustrated in which thefan motor 20 generates a wind in a direction away from thesecond opening 18 of the attaching unit 13 (from right to left as viewed inFIG. 5 ), thefan motor 20 may be driven so as to generate a wind in a direction approaching thesecond opening 18 of the attaching unit 13 (from left to right as viewed inFIG. 5 ). In such a case, the air flow that cools theheat sink 14 is directed opposite to the direction indicated by the arrows inFIG. 5 . - Further, although in
FIG. 5 , a state is illustrated in which an intake portion or an exhaust portion of thefan motor 20 is disposed opposite to thesecond opening 18, in the present invention, the intake portion or the exhaust portion of thefan motor 20 may be disposed opposite to thefirst opening 17. - Further, in the second embodiment as well, it is possible to cool the
heat sink 14 outside thecontrol panel 11 by thefan motor 20 disposed in thecontrol panel 11 using thefirst duct 15 and thesecond duct 19 as in the first embodiment described above. In this manner, it is possible to attach and remove thesecond duct 19 and thefan motor 20 from the front side of thecontrol panel 11 when exchanging and inspecting thefan motor 20. Further, it is possible to freely select the size of thefan motor 20 since there is no need to pass thefan motor 20 through the hole or notch formed in therear wall portion 11 b of thecontrol panel 11 or the attachingunit 13 of themotor control unit 10. - Note that, although in the first and second embodiments exemplified above, the
second duct 19 and thefan motor 20 are disposed above themotor control unit 10, the present invention is not limited to such a configuration. In other words, a structure may be possible in which thesecond duct 19 and thefan motor 20 are disposed below themotor control unit 10 so that the wind is sent from below theheat sink 14 to thereabove or sent from above theheat sink 14 to therebelow. - Further preferably, unillustrated cooling fins or protrusions that constitute the
heat sink 14 are formed such that air is allowed to pass therethrough in a vertical direction. Moreover, assembly is facilitated by integrating thefirst duct 15 and theheat sink 14 with each other beforehand. Theheat sink 14 may be attached to the second surface of the attachingunit 13 or may be structured integral with the attachingunit 13. - Further, in each of the embodiments described above, the
motor control unit 10 is mounted in thecontrol panel 11 by fixing the attachingunit 13 provided on one side of themotor control unit 10 to thefront surface 11b 1 of therear wall portion 11 b of thecontrol panel 11. Such attachingunit 13 is prepared as an attachment separable from themotor control unit 10 as illustrated inFIGS. 2 and 3 , and themotor control unit 10 is mounted in thecontrol panel 11 using the attachment. However, in the present invention, the attachingunit 13 may be one that is composed of a portion of themotor control unit 10, such, for example, as a flange. In this instance, theheat sink 14 is attached directly to one side of themotor control unit 10. - Further, in each of the embodiments described above, as illustrated in
FIGS. 3-5 , thesecond duct 19 is attached to the attachingunit 13 in a manner to cover both thefirst opening 17 and thesecond opening 18. Thus, the space inside thesecond duct 19 is tightly closed in thecontrol panel 11. Therefore, even when outside air outside thecontrol panel 11 which contains dust, cutting oil or the like around a machine tool, for example, is introduced from outside of thecontrol panel 11 into thesecond duct 19 through thefirst opening 17 or thesecond opening 18, an effect is provided that such dirty outside air is prevented from being introduced into thecontrol panel 11. In order to enhance this effect, it is preferable to ensure air tightness in thesecond duct 19 by interposing a seal member between thesecond duct 19 and the attachingunit 13. In addition, awall panel 22 such as indicated by a dot-dash-line inFIG. 1 may be attached to the outside surface of thecontrol panel 11, thereby reducing the possibility that dirty outside air is introduced into thecontrol panel 11. - Further, in each of the embodiments described above, as illustrated in
FIGS. 2 and 3 , thefirst opening 17 and thesecond opening 18 are formed through the attachingunit 13. However, thefirst opening 17 may be formed as a communication port that provides, between thefirst duct 15 and thesecond duct 19, communication outside of thefirst duct 15 and inside of thesecond duct 19. Furthermore, thesecond opening 18 may be formed as a communication port that provides, between thefirst duct 15 and thesecond duct 19, communication between inside of thefirst duct 15 and inside of thesecond duct 19. Therefore, for example, thefirst opening 17 and thesecond opening 18 are formed in thesecond duct 19, or alternatively thefirst opening 17 is formed in thesecond duct 19, while thesecond opening 18 is formed in thefirst duct 15. The present invention also encompasses an aspect in which the attachingunit 13 is formed with a single through hole, such as one which includes bothsuch openings - Further, while in each of the embodiments described above, as illustrated in
FIGS. 2 and 3 , thefirst duct 15 and thesecond duct 19 are attached to the attachingunit 13, the present invention also encompasses an aspect in which thefirst duct 15 and thesecond duct 19 are connected without interposing the attachingunit 13 between thefirst duct 15 and thesecond duct 19. In the aspect in which thefirst duct 15 and thesecond duct 19 are connected in such a manner, for example, thesecond opening 18 is formed directly in therear wall portion 11 b of the control panel apart from thehole 16 which permits theheat sink 14 to pass therethrough, such as illustrated inFIG. 2 . Thefirst duct 15 and thesecond duct 19 each are attached directly to therear wall portion 11 b of the control panel. Thus, between thefirst duct 15 and thesecond duct 19, there may be formed thefirst opening 17 which allows communication between outside thefirst duct 15 and inside thesecond duct 19 and thesecond opening 18 which allows communication between inside thefirst duct 15 and inside thesecond duct 19. - Note that, although in the foregoing, exemplary embodiments have been illustrated, the present invention is not limited to the respective embodiments described above, and the respective embodiments described above can be changed to various shapes, structures, materials or the like within a scope that does not depart from the idea of the present invention.
- According to the first aspect and the eighth aspect of the present invention, the first surface of the attaching unit provided in the motor drive device is a surface is directed toward the front of the control panel, and on the first surface, there is provided the second duct in which the air blower, e.g., the fan motor is provided. Hence, in the state in which the motor control unit is mounted in the control panel using the attaching unit, both the second duct and the air blower are disposed in the control panel. Further, between the first duct and the second duct, there are formed the first opening that permits of communication between outside the first duct and inside the second duct, and the second opening that permits of communication between inside the first duct and inside the second duct. Thus, when the air blower in the second duct is driven, an air flow occurs from the first opening to the second opening or from the second opening to the first opening. Thereupon, an air flow occurs also in the first duct connecting the second opening and the heat sink, and thus wind hits the heat sink whereby the heat sink is cooled. In other words, in the present invention, it is possible to enhance the cooling effect of the heat sink without disposing the air blower adjacent to the heat sink. Therefore, even with a configuration in which the heat sink is disposed outside the control panel, there is no need to pass the air blower through the hole, notch or the like formed in the rear wall portion of the control panel as in the conventional technique. Consequently, it is possible to freely select the size of the air blower.
- Further, according to the second aspect of the present invention, when exchanging and inspecting the air blower, it is possible to attach and remove the second duct and the air blower from the front side of the control panel.
- According to the third aspect of the present invention, the air blower is attachable and removable with respect to the second duct, so that the air blower and the second duct can be attached to the first surface of the attaching unit in unison and in combination.
- According to the fourth aspect of the present invention, the first duct is attachable and removable with respect to the heat sink, so that the heat sink and the first duct can be attached to the second surface of the attaching unit in unison and in combination.
- According to the fifth aspect of the present invention, the first duct is formed as a portion of the heat sink, so that the heat sink can be effectively cooled by wind passing through the first duct.
- According to the sixth aspect and the seventh aspect of the present invention, the air blower can generate, in the second duct, an air flow from the first opening to the second opening formed in the attaching unit or vice versa.
Claims (8)
1. A motor drive device comprising:
a motor control unit disposed in a control panel;
an attaching unit provided on one side of the motor control unit and having a first surface directed toward front of the control panel and a second surface opposite to the first surface;
a heat sink attached to the one side of the motor control unit or the second surface of the attaching unit to absorb heat of the motor control unit;
a first duct disposed in opposing relationship to the second surface of the attaching unit;
a second duct disposed at a side opposite to a side of the attaching unit at which the first duct is disposed and in opposing relationship to the first duct; and
an air blower disposed in the second duct,
wherein:
between the first duct and the second duct, there are formed a first opening that allows communication between outside of the first duct and inside of the second duct, and a second opening that allows communication between inside of the first duct and inside of the second duct;
the first duct is provided so as to connect the heat sink and the second opening with each other;
the second duct is provided so as to connect the first opening and the second opening with each other; and
the air blower is disposed so as to generate an air flow from the first opening to the second opening or from the second opening to the first opening.
2. The motor drive device according to claim 1 , wherein the second duct and the air blower are removably attached with respect to the first surface.
3. The motor drive device according to claim 1 , wherein the air blower is removably attached with respect to the second duct.
4. The motor drive device according to claim 1 , wherein the first duct is removably attached with respect to the heat sink.
5. The motor drive device according to claim 1 , wherein the first duct is formed as a portion of the heat sink.
6. The motor drive device according to claim 1 , wherein the air blower is disposed in the second duct so as to blow air in a direction parallel to the first surface.
7. The motor drive device according to claim 1 , wherein the air blower is disposed in the second duct so as to blow air in a direction intersecting with the first surface, and an intake portion and an exhaust portion of the air blower are disposed in opposing relationship to the second opening.
8. A control panel including the motor drive device according to claim 1 , wherein:
a notch or hole that allows both the heat sink and the first duct to pass therethrough is formed in a rear wall portion of the control panel; and
the second surface of the attaching unit is fixed to the rear wall portion in the control panel, both the heat sink and the first duct are disposed outside the control panel through the notch or hole, and the first opening is in communication with a space outside the first duct through the notch or hole.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015-135278 | 2015-07-06 | ||
JP2015135278A JP6294263B2 (en) | 2015-07-06 | 2015-07-06 | Motor drive device capable of replacing fan motor, and control panel equipped with the same |
Publications (2)
Publication Number | Publication Date |
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US20170013743A1 true US20170013743A1 (en) | 2017-01-12 |
US9877418B2 US9877418B2 (en) | 2018-01-23 |
Family
ID=57731721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/189,344 Active US9877418B2 (en) | 2015-07-06 | 2016-06-22 | Motor drive device in which fan motor is exchangeable and control panel including same |
Country Status (4)
Country | Link |
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US (1) | US9877418B2 (en) |
JP (1) | JP6294263B2 (en) |
CN (2) | CN106341071B (en) |
DE (1) | DE102016111861B4 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6294263B2 (en) * | 2015-07-06 | 2018-03-14 | ファナック株式会社 | Motor drive device capable of replacing fan motor, and control panel equipped with the same |
WO2017218614A1 (en) | 2016-06-15 | 2017-12-21 | Hunter Fan Company | Ceiling fan system and electronics housing |
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JP6294263B2 (en) * | 2015-07-06 | 2018-03-14 | ファナック株式会社 | Motor drive device capable of replacing fan motor, and control panel equipped with the same |
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2015
- 2015-07-06 JP JP2015135278A patent/JP6294263B2/en active Active
-
2016
- 2016-06-22 US US15/189,344 patent/US9877418B2/en active Active
- 2016-06-28 CN CN201610490987.9A patent/CN106341071B/en active Active
- 2016-06-28 CN CN201620662579.2U patent/CN205911992U/en not_active Withdrawn - After Issue
- 2016-06-29 DE DE102016111861.3A patent/DE102016111861B4/en active Active
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US4520425A (en) * | 1982-08-12 | 1985-05-28 | Mitsubishi Denki Kabushiki Kaisha | Control apparatus with improved structure for cooling circuit elements |
US4742864A (en) * | 1986-10-20 | 1988-05-10 | Carrier Corporation | Passive ventilated control box |
US6233149B1 (en) * | 1997-04-23 | 2001-05-15 | General Electric Company | High power inverter air cooling |
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Also Published As
Publication number | Publication date |
---|---|
CN106341071B (en) | 2020-03-24 |
CN106341071A (en) | 2017-01-18 |
JP6294263B2 (en) | 2018-03-14 |
US9877418B2 (en) | 2018-01-23 |
CN205911992U (en) | 2017-01-25 |
DE102016111861A1 (en) | 2017-03-23 |
DE102016111861B4 (en) | 2019-07-11 |
JP2017017951A (en) | 2017-01-19 |
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